Pour the meatballs into the crockpot.
In a large bowl, add the beef broth, cream of mushroom soup, half and half, sour cream, cornstarch, Worcestershire sauce, salt, pepper, onion powder, garlic powder, and paprika. Stir with a whisk until completely smooth and well incorporated.
Pour the sauce over the meatballs and cover with the crockpot lid.
Cook on high for 3-4 hours (or low for 6-7 hours).
When the meatballs are ready to serve, garnish them with fresh chopped parsley (if desired). Serve with egg noodles.
